Adding Serilog Breaks Logging Actuator

[TimHess]

Serilog hijacks the logging pipeline via a custom ILoggerFactory - once it has been added with UseSerilog(), the Steeltoe DynamicLoggerProvider is not used by the application.

References:

• https://stackoverflow.com/questions/52891369/how-to-set-steeltoe-dynamic-logging-works-with-3rd-party-loggers-as-serilog/52977491
• https://andrewlock.net/adding-serilog-to-the-asp-net-core-generic-host/#how-the-library-works-behind-the-scenes
• https://github.com/serilog/serilog-aspnetcore/blob/master/src/Serilog.AspNetCore/AspNetCore/SerilogLoggerFactory.cs

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/161463156

The labels on this github issue will be updated when the story is started.

[TimHess]

We'll need a Serilog-compatible implementation of IDynamicLoggerProvider for the logging actuator to function with Serilog.

This component may be part of the solution: https://nblumhardt.com/2014/10/dynamically-changing-the-serilog-level/